Stencil-sheet.



PATENTED PEB. 21, 1905.

MGION J. DQGARTBR.

STENGIL SHEET.

APPLIOATION FILED FEB. 10. 1904.

mvENToa WITNESSES ATTORNEY TUNITED STATES Patented February 21, 1905.

PATENT OFFICE.

MoION JAMES DOUGLAS CARTER, OF HACKNEY, ENGLAND, ASSIGNOR TO A. B. DICKCOMPANY," CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

STENClL-SHEET.

SPECIFICATION forming part of Letters Patent No. 783,101, dated February 21, 1905.

Application filed February l0, 1904. Serial No. 192,960.

To all whom, t may concern:

Be it known that I, MoIoN J Auns DOUGLAS CARTER, a subject of the King of Great Britain, residing at 2 Wayland avenue, Hackney, England, have invented a certain new and useful Improvement in Stencil-Sheets, of which the following is a specification.

Heretofore it has been proposed to provide a waxed stencil-sheet with a backing of substantial paper bearing figures, scales, or other indicating media designed to assist the typist in the cutting7 or preparation of the stencil-sheet for duplicating purposes. The present invention relates to such a sheet and backing. I have found, however, that a much improved result may be obtained through the use of a backing-sheet the face whereof is provided-as, for instance, by printing -'inlrwith a color contrasting sharply with the color of the superposed stencil-sheet. Two features of such improved result are as follows: When the face of the backing-sheet is of a contrasting color, the characters cut upon the stencilsheet are more readily visible to the typist, who while cutting the stencil may not only distinguish the figures, scales, or other indicating media more clearly, but may also more readily scan that portion of the stencil already cut. Again, I have found that where the face of the backing-sheet has been covered or substantially covered by a printing-ink such sheet is most eflicientfalso as an extractor, the small particles of wax expressed from the fibers of the base of the stencil-sheet by the impact of the type clinging to such printed backingsheet, whereby the same are removed when the stencil and backing sheets are separated and giving to lthe prints made from the former the clean fine lines characteristic of ribbon-work from a type-writing machine.

The invention is illustrated in the accompanying drawing, in which the figure is a perspective view illustratingthe backing and stencil sheets A and B attached at one end when the composite so formed is adapted to be secured upon the drum of a stencil-printing machine. The backing-sheet A preferably bears upon its face certain scales and figures which may, if desired, be similar to those illustrated and described in Letters Patent No. 732,564. Instead, however, of printing these in black upon a white ground I practically cover the entire surface of the backing-sheet with ink, such as printing-ink, omitting the figures, scales, zc., which are therefore left in the original color of the backing. The stencilsheet is commonly of a Very light color, being made of a substantially white porous base coated with paraffin, and the contrast between such a stencil-sheet and the black (or other colored) face of the backing-sheet is therefore marked, and the facility with which the characters on .the latter may be seen through the stencil-sheet and that with which the characters out upon the stencil-sheet may be read is correspondingly increased. In addition the printed back-sheet is to great extent ink-proof, grease-proof, and waterproof, and the coaction of the printed surface andthe stencil-sheet during the stencil-cutting operation (heretofore alluded to) is such as to produce a much better result than has hereto fore been possible.

If,deSred,the composite structure above described may be combined with a i top sheet C,

preferably of thin transparent material, such A vas k-yoshino, the function whereof is to protect the stencil-sheet and'prevent the wax thereon from clogging the type of the writing-machine.

Having nowdescribed my invention, what I claim is- 1. A backing-sheet for stencil use having l 3. A backing-sheet for Stencil use having of the sheet prior to the application of the IO the major portion of its operative face covered printing-ink, substantially as described. with a dark color, and 2in-indicating device In Witness whereoflhave heretosetmy hand thereon in acontrasting color, substantially as and seal J anuary l1, 1904. Y

5 described.

4. A backing-sheet for stencil use having MCION JAMES DOUGLAS CARTER ['L' 5'] substantially its entire operative face, save an Witnesses: indicating device, covered with dark piintirig- H. D. J AMESQN, ink, said indicating device being 1n the color A. NUTTING. 

